Moving or positioned across a ship from one side to the other, perpendicular to the ship's length.
From 'athwart' (Old English æt + hwærf, 'turned against') combined with 'ship' (Old English scip). The term evolved in nautical contexts to describe motion crossing the vessel's axis.
Sailors developed this term because ship navigation required precise directional language—if you said something was 'athwartship,' everyone on deck immediately knew it cut across the vessel's path, which mattered for cargo placement and safety during rough seas.
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